<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>

    <script type="text/javascript">
			function getCookie(c_name) {
				if (document.cookie.length > 0) {
					c_start = document.cookie.indexOf(c_name + "=")
					if (c_start != -1) {
						c_start = c_start + c_name.length + 1
						c_end = document.cookie.indexOf(";", c_start)
						if (c_end == -1) c_end = document.cookie.length
						return unescape(document.cookie.substring(c_start, c_end))
					}
				}
				return ""
			}

			function setCookie(c_name, value, expiredays) {
				var exdate = new Date()
				exdate.setDate(exdate.getDate() + expiredays)
				document.cookie = c_name + "=" + escape(value) +
					((expiredays == null) ? "" : ";expires=" + exdate.toGMTString())
			}

			function checkCookie() {
				username = getCookie('username')
				if (username != null && username != "") {
					alert('Welcome again ' + username + '!')
				}
				else {
					username = prompt('Please enter your name:', "")
					if (username != null && username != "") {
						setCookie('username', username, 365)
					}
				}
			}
    </script>
</head>
<body onLoad="checkCookie()">

</body>
</html>